Safety appliance for elevators.



j PATENTED NOV. 5,1907.

JIL. 'BOREN. I SAFETY APPLIANCE FOR ELEVATORS. I 7

PPPPPP ATIOIN FILED APR. 2, 1907. v

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PATEITED NOV. 5, 1907.

J. L. BOREN.

SAFETY APPLIANCE FOB. ELEVATORS. APPLICATION FILED APR. 2, i907.

JAMES BOREN, OF OARTERVILLE, ILLINOIS;

SAFETY APPLIANCE FOR ELEVATORS I I To all whom it may concern:

Be it known that 1, JAMES L.-BOREN, a citizen of the United States, residing at Carterville, in the county of Williamson and Stateof Illinois, have invented'new and useful Improvements in Safety Appliances for Elevators, of which the following is aspecification.

This invention relates to safety appliances for elevators; and it has for its object to provide a simple and efficient device-whereby, in the event of breakage, of the hoisting rope or element, the descent of the elevator car or cage will be positively checked or arrested, thus reducing or obviating the danger of injury to occupants of the cage and to any persons who may be stationed in the shaft of the elevator beneath the cage.

Further objects of the invention are to simplify and improve the construction and operation of this class of devices.

With these and other ends in view which will readily appear as the nature of the inventionis better under} stood, the same consists in the improved construction and novel arrangement and combination of parts which will be hereinafter fully described and particularly pointed out in the claims.

In the accompanying drawings has been illustrated a simple and preferred form of the invention; it being, however, understood that no limitation is necessarily made to the precise structural details therein exhibited, but that changes, alterations and modifications within the scope of the invention may be resorted to when de-- sired! The invention is applicable to any of the various forms of elevators for conveying passengers, merchandise or bulk material in which a cage or car is arranged to travel in a vertical shaft; the latter being usually provided with rails or uprights for guiding the car; and in the drawings the invention has been shown applied to an ordinary mine elevator, the cageof which is provided with a tilting platform.

In said drawings, Figure 1 is a side elevation showing the cage or car near the upper landing of an elevator shaft; the casing of the shaft having been removed on the near side. Kg. 2 is a similar view showing the car at the upper landing the tilting platform in dumping or dischar ing position. 3 is a vertical sectional view showing the car or cage at an intermediate position in the shaft with the safety appliance in operation. Fig. 4 is a transverse sectional view taken on theplane indicated by the line 4-4 in- Fig. 3. Fig. 5 is a detail view of one of the connecting links.

Corresponding parts in the several figures are denoted by like characters of reference.

The elevator shaft A includes the corner posts or up- .rights 11 which are onnected at intervals by crossbars orbraces 2-2 supporting the walls of the casing 3. Vertically disposed guide rails 44 are disposed at the sides of the shaft intermediate the corner posts.

Specification of Letters Patent.

. Application filed April 2. 1907- Serial No. 365.939f

' Patented Nov. 5,1907.

The car or cage includes a bottom frame 5, the sides of which are provided with clips 6 engaging the guide rails 4, said frame being supported by yokes 7, one at each side thereof, and said yokes being connected at their upper ends to a cross-bar 8 having terminal clips 9 guided upon the rails 4; said clips, as shown in the drawings, may be formed by straps or bars 10 secured upon the sides of the cross-bar 8, to strengthen and re inforce the latter.

11 is a tilting platform which is provided upon its underside with angular or V-shaped brackets 12, the v 'apices of which are disposed between the longitudinal center of the platform and the dumping or discharge side of the latter; this being readily accomplished by making the limbs of the vshaped brackets of unequal length, as will be clearly seen in the drawings; the apices of the brackets are provided with hinge members 13 connected by pins or bolts 14 with boxings 15 upon the frame 5, and the'latter is provided with supporting members 16 whereby the tilting platform 11 is supported normally .in anapproximately horizontal position. 7

Supported in boxes or bearings 17 upon the under sides of the side sills 18 of the tilting platform is a transversely disposed rock shaft 19 provided intermediate its ends with oppositely extending cranks 20, and having terminal radially extending arms 21 both of which extend in the same direction at a suitable angle, approximating ninety degrees, to the intermediate cranks 20. Said radial arms are connected by links 22 with the lower ends of the arms or side members of a yoke'or bail 23, the cross-bar of which is provided with a cen trally disposed eye 24 which is connected by a link 25 with the flexible element 26 which constitutes the hoisting element whereby the car is suspended, and

which is provided with divergent branches 27 connected with the upper ends of the suspending yokes 7,

- the arrangement being such that when the flexiblesuspending element is intact, the rock shaft will be sustained with its oppositely extending cranks 20 disposed in an approximately vertical plane.

Supported in boxes upon the undersides of the sills of the tilting platform 11, adjacent to the ends of the latter, are shafts 28 carrying aprons 29 consisting of solid plates of steel, the lower edges of which are curved outward in the direction of the end walls of the shaft casing, and provided with teeth or serrations 30, as clearly seen in Fig. 4. One of the cranks 20 of the rock shaft 19 is connected with a fixed point upon the underside of the platform 11, for instance, with one of the shafts 28, by a stout spring 31, the tension of which will be exerted to oscillate said rock shaft. The cranks 20 are connected with the aprons 29 by means of links 32.engaging eyes 33 upon the insides of said aprons.

f Each of the links 32 is preferably composed of two oyerispping members 32 and 32 suitably connected be adjusted upon tilting platiorms of different widths.

The tilting platform is provided adjacent to.its dis,

charge end, with an engaging member, such as a roller 36 adapted to be engaged by a lug or cam 37 connected with the elevator casing adjacent to the top landing Where the load is to be discharged, for the purpose of tilting the platform aswill be seen in Fig. 2 of the drawings.

The operation of this invention will be readily understood from the foregoing description taken incorn nection with the drawings. nder normal conditions, when the weight of the car is sustainedby the hoisting element, the upward stress of the latter upon the yoke or bail 23 maintains the rock shaft 19 with its oppositely extending cranks 20 in an approximately vertical plane against the tension of the spring 31-, the free edgesoi the aprons 29 being thus held out of engagement withthe end walls of the shaftcasing; If the cage'or car should suddenly descend, owing tobrealiage or to asudden accidental slackening oi the hoisting element, the rock shaft 19 will be oscillated under the tension ofthe spring 31, and the aprons 29 will be i'orced inan outward direction by the links 32, causing their serrated edges to firmly engage and bite in-tho wails'oi tliecasing, tlius positively checking the-downwardl movement'of the car, and holding the latter se curely without danger to the occupants. A similar oscillation of the rock shaft 19 will occur when the platform ll is tilted by engagement of the roller 36 with'tn'e'cam 37-atrthe'top landing where the load is to be discharged, the free edges of the aprons-29 being thus-swung in' an outward direction; at this point, however, owing to the'tilted' condition-oftheplatform, the. apron-at the rearm nd' of the latter will remain clear of,

wall 3'andform a guard whereby lumps of coal or other material that is being" discharged from the platform will be prevented from droppingwithin the shaft casing; as Scenes, by lowering the, car or cage, the tilting platform isrestored. to itsnormal horizontal'positiomi of elevator.carsfor'cagesnre' usually constructed to enof two witnesses.

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ga e theguide rails,-and the latter, being oftentimes frail or imperfectly secured, are liable to give way under the sudden strain to'which they are thus exposed,

thus rendering the safety appliance useless and irus trating the object for which it is provided. By the present invention the entire width of the shaft casing is engaged by the safety aprons, and failure of the latter to act and to'prevent -the car or cage from dropping is practically impossible. Even if Jone of the aprons should fail to act, the other? one will b e'sufiicient to check the descent of the car; and even-lithe-elevator casing should. becomeripped" and torn, the torn pertions will'be thrown inward, beneath thecarpl'atiorm',

and stopthe descent. v

In cases where the wall's'of' the'shait casing arema'ri'e themat intervals with Crossbars, 'assliown in dotted of sheet iron, it may be'found necessary to-provide lines in Fig. l of the drawingaat 38; and such cross bars will then be effectively engaged by the safety aprons in the event'oi accident. I

Having thus fully described the invention; what I claim as new is 1. In a dell-lee of the class-described; an elevator.- slim including a casing; 11 hoisting element, a: can orcage includinga bottom frame connectedwith'and supported bythe hoisting element and a tilting platform supported upon the bottom frame, a rock shaft mounted for oscillation upon' the tilting platform and havlng oppositely extending cranks and terminal radialarm's, apmnhlngemyi connected with the platform, llnksoonnecting.theapromr withv the cranks of the rock shaft, 9. spring disposed to force the free edges of the aprons in thedli'ectlon oftlie walls of the casing, a yoke'or'bail connected with tile 35 hoisting element, linlgs connecting theslde members oi? saldyoke with the terminal arms oftbe roekshaft, an engaging member upon the tilting platform; and a cam member connected with the shaft. structure in the patli on said engaging member. I

2, In a device of the class described, the combination: with an elevator car or cage of a hingedly supported apron of a width approximately equal to that of the car. or cage, and means for projecting the free edge of said ,apron in an outward direction.

. links connecting said cranks with the aprons.

In testimony whereof, I affi'x my signature in presence 7 JAMES L. BOREN. I Witnesses A. I. GUERRETTAZ, A. Kl ELLEn. 

